diff --git a/tests/grouptools/groupadd/11_groupadd_invalid_GID/data/groupadd.err b/tests/grouptools/groupadd/11_groupadd_invalid_GID/data/groupadd.err
index f82bfda0..1b0872bf 100644
--- a/tests/grouptools/groupadd/11_groupadd_invalid_GID/data/groupadd.err
+++ b/tests/grouptools/groupadd/11_groupadd_invalid_GID/data/groupadd.err
@@ -1 +1 @@
-groupadd: invalid numeric argument '1002a'
+groupadd: invalid group ID '1002a'
diff --git a/tests/grouptools/groupadd/12_groupadd_negativ_GID/data/groupadd.err b/tests/grouptools/groupadd/12_groupadd_negativ_GID/data/groupadd.err
index da7f4b31..26012b6f 100644
--- a/tests/grouptools/groupadd/12_groupadd_negativ_GID/data/groupadd.err
+++ b/tests/grouptools/groupadd/12_groupadd_negativ_GID/data/groupadd.err
@@ -1 +1 @@
-groupadd: invalid numeric argument '-1002'
+groupadd: invalid group ID '-1002'
diff --git a/tests/grouptools/groupadd/18_groupadd_no_more_GID/data/groupadd.err b/tests/grouptools/groupadd/18_groupadd_no_more_GID/data/groupadd.err
index 0d9ff9ee..b3fd5c10 100644
--- a/tests/grouptools/groupadd/18_groupadd_no_more_GID/data/groupadd.err
+++ b/tests/grouptools/groupadd/18_groupadd_no_more_GID/data/groupadd.err
@@ -1,2 +1 @@
 groupadd: Can't get unique GID (no more available GIDs)
-groupadd: can't create group
diff --git a/tests/grouptools/groupadd/19_groupadd_-r_no_more_system_GID/data/groupadd.err b/tests/grouptools/groupadd/19_groupadd_-r_no_more_system_GID/data/groupadd.err
index 0d9ff9ee..b3fd5c10 100644
--- a/tests/grouptools/groupadd/19_groupadd_-r_no_more_system_GID/data/groupadd.err
+++ b/tests/grouptools/groupadd/19_groupadd_-r_no_more_system_GID/data/groupadd.err
@@ -1,2 +1 @@
 groupadd: Can't get unique GID (no more available GIDs)
-groupadd: can't create group
diff --git a/tests/grouptools/groupmod/19_groupmod_change_gid_error_invalid_GID/data/groupmod.err b/tests/grouptools/groupmod/19_groupmod_change_gid_error_invalid_GID/data/groupmod.err
index 0ad26136..c8745ef6 100644
--- a/tests/grouptools/groupmod/19_groupmod_change_gid_error_invalid_GID/data/groupmod.err
+++ b/tests/grouptools/groupmod/19_groupmod_change_gid_error_invalid_GID/data/groupmod.err
@@ -1 +1 @@
-groupmod: invalid numeric argument '1001a'
+groupmod: invalid group ID '1001a'
diff --git a/tests/grouptools/groupmod/20_groupmod_change_gid_error_negativ_GID/data/groupmod.err b/tests/grouptools/groupmod/20_groupmod_change_gid_error_negativ_GID/data/groupmod.err
index 53d26f61..824372f3 100644
--- a/tests/grouptools/groupmod/20_groupmod_change_gid_error_negativ_GID/data/groupmod.err
+++ b/tests/grouptools/groupmod/20_groupmod_change_gid_error_negativ_GID/data/groupmod.err
@@ -1 +1 @@
-groupmod: invalid numeric argument '-1001'
+groupmod: invalid group ID '-1001'